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The strong interactions at low energy scales determine the state of the supranuclear matter in the pulsar-like compact objects. It is proposed that the bulk strong matter could be composed of strangeons, which are quark clusters with a…

General Relativity and Quantum Cosmology · Physics 2021-11-25 Yong Gao , Xiao-Yu Lai , Lijing Shao , Ren-Xin Xu

Pulsar-like objects are extremely compact, with an average density that exceeds nuclear saturation density, where the fundamental strong interaction plays an essential role, particularly in the low-energy regime. The internal structures and…

High Energy Astrophysical Phenomena · Physics 2025-11-04 Chengjun Xia , Xiaoyu Lai , Renxin Xu

The nature of pulsar-like compact stars is essentially a central question of the fundamental strong interaction (explained in quantum chromo-dynamics) at low energy scale, the solution of which still remains a challenge though tremendous…

High Energy Astrophysical Phenomena · Physics 2017-08-01 Xiaoyu Lai , Renxin Xu

The strong interaction at low energy scales determines the equation of state (EOS) of supranuclear matters in neutron stars (NSs). It is conjectured that the bulk dense matter may be composed of strangeons, which are quark clusters with…

General Relativity and Quantum Cosmology · Physics 2022-10-06 Hong-Bo Li , Yong Gao , Lijing Shao , Ren-Xin Xu , Rui Xu

The observations of compact star inspirals from LIGO/Virgo combined with mass and radius measurements from NICER provide a valuable tool to study the highly uncertain equation of state (EOS) of dense matter at the densities characteristic…

High Energy Astrophysical Phenomena · Physics 2025-03-13 Wen-Li Yuan , Chun Huang , Chen Zhang , Enping Zhou , Renxin Xu

We derive an equation of state (EOS) for strange matter, starting from an interquark potential which (i) has asymptotic freedom built into it, (ii) shows confinement at zero baryon density and deconfinement at high density and (iii) gives a…

Astrophysics · Physics 2009-10-31 Mira Dey , Ignazio Bombaci , Jishnu Dey , Subharthi Ray , B. C. Samanta

Inspired by various astrophysical phenomenons, it is suggested that pulsar-like compact stars are comprised entirely of strangeons (quark-clusters with three-light-flavor symmetry) and a small amount of electrons. In order to better…

Nuclear Theory · Physics 2022-05-12 Zhi-Qiang Miao , Cheng-Jun Xia , Xiao-Yu Lai , Toshiki Maruyama , Ren-Xin Xu , En-Ping Zhou

The observations of compact star inspirals from LIGO/Virgo provide a valuable tool to study the highly uncertain equation of state (EOS) of dense matter at the densities in which the compact stars reside. It is not clear whether the merging…

High Energy Astrophysical Phenomena · Physics 2021-08-19 Zhiqiang Miao , Jin-Liang Jiang , Ang Li , Lie-Wen Chen

The properties of strange quark stars are studied within the quasi-particle model. Taking into account the chemical equilibrium and charge neutrality, the EOS of $ (2+1) $-flavor quark matter is obtained. We illustrate the parameter spaces…

High Energy Physics - Phenomenology · Physics 2020-11-10 Wen-Hua Cai , Qing-Wu Wang

We have studied strange star properties both at zero temperature and at finite temperatures and searched signatures of strange stars in gamma-ray, x-ray and radio astronomy. We have a set of Equations of State (EoS) for strange quark matter…

Astrophysics · Physics 2009-06-23 Manjari Bagchi , Subharthi Ray , Jishnu Dey , Mira Dey

It was conjectured that the basic units of the ground state of bulk strong matter may be strange-clusters called strangeons, and they can form self-bound strangeon stars that are highly compact. Strangeon stars can develop a strange quark…

Nuclear Theory · Physics 2024-01-09 Chen Zhang , Yong Gao , Cheng-Jun Xia , Renxin Xu

The recent observation of the pulsar PSR J1614-2230 with a mass of 1.97 +/- 0.04 M_sun gives a strong constraint on the quark and nuclear matter equations of state (EoS). We explore the parameter ranges for a parameterized EoS for quark…

High Energy Astrophysical Phenomena · Physics 2011-10-11 Simon Weissenborn , Irina Sagert , Giuseppe Pagliara , Matthias Hempel , Jürgen Schaffner-Bielich

Some time ago we have derived from the QCD Lagrangian an equation of state (EOS) for the cold quark matter, which can be considered an improved version of the MIT bag model EOS. Compared to the latter, our equation of state reaches higher…

High Energy Physics - Phenomenology · Physics 2016-11-24 D. A. Fogaça , S. M. Sanches , T. F. Motta , F. S. Navarra

The fact that strange sea quarks are abundant in the nucleons, but with zero net strangeness, is of great importance for understanding the nature of matter condensed by the strong interaction, particularly in the context of the ``gigantic…

High Energy Astrophysical Phenomena · Physics 2025-09-23 Haoyang Qi , Renxin Xu

This work studies the influence of scalar dark matter on the structural properties of strange quark stars (SQS) within a one-fluid framework, considering Yukawa interactions between dark matter and quark matter. Contributions from…

High Energy Physics - Phenomenology · Physics 2025-03-14 J. Sedaghat , G. H. Bordbar , M. Haghighat , S. M. Zebarjad

Properties of neutron stars in GW170817 are investigated using different equations of state (EoS) involving nucleons, $\Lambda$ hyperons, quarks resulting in $2M_{\odot}$ neutron stars. This calculation is performed using the same EoS for…

High Energy Astrophysical Phenomena · Physics 2019-01-02 Sajad A. Bhat , Debades Bandyopadhyay

The state of supranuclear matter in compact star remains puzzling, and it is argued that pulsars could be strangeon stars. What if binary strangeon stars merge? This kind of merger could result in the formation of a hyper-massive strangeon…

High Energy Astrophysical Phenomena · Physics 2018-03-14 X. Y. Lai , Y. W. Yu , E. P. Zhou , Y. Y. Li , R. X. Xu

This study investigates the structural properties of strange quark stars (SQS) using a Quantum Chromodynamics (QCD) perturbative model combined with the latest Particle Data Group dataset. Given the energy scale present in compact stars,…

High Energy Astrophysical Phenomena · Physics 2025-01-30 J. Sedaghat , G. H. Bordbar , S. M. Zebarjad

Strangeon stars, which are proposed to describe the nature of pulsar-like compact stars, have passed various observational tests. The maximum mass of a non-rotating strangeon star could be high, which implies that the remnants of binary…

High Energy Astrophysical Phenomena · Physics 2024-01-23 Xi-Yan Yang , Xiao-Yu Lai , Wei-Wei Tan , Ren-Xin Xu

Stable micro-nucleus is 2-flavored (u and d), whereas stable macro-nucleus could be 3-flavored (u, d and s) if the light flavor symmetry restores there. Nucleons are the constituent of a nucleus, while strangeons are named as the…

High Energy Astrophysical Phenomena · Physics 2018-02-14 Jiguang Lu , Renxin Xu
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